require 'vendor/autoload.php';

    //if you want to change the namespace/path from 'GetChargedPay' - lines[1-5] - to your desired name,
    i.e. (use GetChargedPay\Api\Amount; to use MyDomain\Api\Amount;), then you must change the folders name that holds
    the API classes as well as change the property 'GetChargedPay' in (autoload->psr-0) of (php-sdk/composer.json) file to your
    desired name and run "composer dump-autoload" command from sdk root

    use GetChargedPay\Api\Amount;
    use GetChargedPay\Api\Payer;
    use GetChargedPay\Api\Payment;
    use GetChargedPay\Api\RedirectUrls;
    use GetChargedPay\Api\Transaction;

    //Payer Object
    $payer = new Payer();
    $payer->setPaymentMethod('all'); //set getchargedpay for wallet only
    $payer->setOrderNo('1234');
    $payer->setItemName('Test Item');
    $payer->setFirstName('Customer First Name');
    $payer->setLastName('Customer Last Name');
    $payer->setEmail('Email Address');
    $payer->setPhone('Phone');

    //Amount Object
    $amountIns = new Amount();
    $amount = 1;
    $convenience_fee = 0; //convience fee purcent if you want to add a part of your merchant fee
    $total = $amount+(($amount*$convenience_fee)/100);
    $amountIns->setTotal($total)->setCurrency('INR'); //must give a valid currency code and must exist in merchant wallet list

    //Transaction Object
    $trans = new Transaction();
    $trans->setAmount($amountIns);

    //RedirectUrls Object
    $urls = new RedirectUrls();
    $urls->setSuccessUrl('http://localhost/getchargedpay_sdk/example-success.php') //success url - the merchant domain page, to redirect after successful payment, see sample example-success.php file in sdk root, example - http://example.com/example-success.php
    ->setCancelUrl('http://localhost/getchargedpay_sdk/example-failure.php'); //cancel url - the merchant domain page, to redirect after cancellation of payment, see sample example-success.php file in sdk root, example - http://example.com/example-failure.php

    //Payment Object
    $payment = new Payment();
    $payment->setCredentials([ //client id & client secret, see merchants->setting(gear icon)
    'client_id' => 'place your client id here', //must provide correct client id of an express merchant
    'client_secret' => 'place your client secret here' //must provide correct client secret of an express merchant
    ])->setRedirectUrls($urls)
    ->setPayer($payer)
    ->setTransaction($trans);

    try {
     $payment->create(); //create payment
     header("Location: ".$payment->getApprovedUrl()); //checkout url
    } catch (Exception $ex) {
     print $ex;
     exit;
    }

Success or Failure Handeling

     /*
    This is the sample success page.

    You must decode the response and get status - success (in case of failure status will be success), in the following pattern (as data is encrypted)

    and then you can do anything you desire, example - display the user success message or insert into your merchant domain's database

     */

    if ($_GET)
    {
        try {
            $encoded = json_encode($_GET, JSON_THROW_ON_ERROR);
        } catch (JsonException $e) {
            print_r($e);
        }

        try {
            $decoded = json_decode(base64_decode($encoded), TRUE, 512, JSON_THROW_ON_ERROR);
        } catch (JsonException $e) {
            print_r($e);
        }

        if ($decoded["status"] === 'success')
        if ($decoded["status"] === 'failure') //in case of failure
        {
            // do anything here, i.e. display to merchant domain pages or insert data into merchant domain's  database
            echo "Status => " . $decoded["status"] . "
";
            echo "Transaction ID => " . $decoded["transaction_id"] . "
";
            echo "Merchant => " . $decoded["merchant"] . "
";
            echo "Currency => " . $decoded["currency"] . "
";
            echo "Amount => " . $decoded["amount"] . "
";
            echo "Fee => " . $decoded["fee"] . "
";
            echo "Total =>" . $decoded["total"] . "
";
            echo "Payment Method =>" . $decoded["payment_method"] . "
";
            echo "Order No => " . $decoded["order_no"] . "
";
            echo "Item Name => " . $decoded["item_name"] . "
";
            echo "Customer First Name => " . $decoded["firstname"] . "
";
            echo "Customer Last Name => " . $decoded["lastname"] . "
";
            echo "Customer Email => " . $decoded["email"] . "
";
            echo "Customer Phone => " . $decoded["phone"] . "
";
        }
    }